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Teletext is broadcast in numbered "pages." For example, a list of news headlines might appear on page 110; a teletext user would type "110" into the TV's remote control to view this page.
The broadcaster constantly sends out pages in sequence.
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His configuration contained all the fundamental elements of classic Teletext including pages of 24 rows with 40 characters each, page selection, sub pages of information and vertical blanking interval data transmission.
A major objective for Adams during the concept development stage was to make Teletext affordable to the home user.
In reality, there was no scope to make an economic Teletext system with 1971 technology.
However, as low cost was essential to the project's long term success, this obstacle had to be overcome.
The Independent Television Authority (ITA) announced their own service in 1973, known as ORACLE (Optional Reception of Announcements by Coded Line Electronics).
Not to be outdone, the GPO immediately announced a 1200/75 baud videotext service under the name Prestel.It is closely linked to the PAL broadcast system used in Europe.Other teletext systems have been developed to work with the SECAM and NTSC systems, but teletext failed to gain widespread acceptance in North America and other areas where NTSC is used.It offers a range of text-based information, typically including news, weather and TV schedules.Paged subtitle (or closed captioning) information is also transmitted within the television signal.Since the Post Office owned the telephones, this was considered to be an excellent way to drive more customers to use the phones.Tags: Adult Dating, affair dating, sex dating